code: def teardown_method(self):
      if len(self.client):
          self.client[:].use_pickle()
  
      # self.client.clear(block=True)
      # close fds:
      for e in filter(lambda e: e.poll() is not None, launchers):
          launchers.remove(e)
  
      # allow flushing of incoming messages to prevent crash on socket close
      self.client.wait(timeout=2)
      self.client.close()
      if hasattr(signal, "SIGALRM"):
          signal.alarm(0)
          signal.signal(signal.SIGALRM, signal.SIG_DFL)
      self.context.destroy()
  
imports: import os
  import signal
  import sys
  import time
  import warnings
  from contextlib import contextmanager
  import pytest
  import zmq
  from decorator import decorator
  from ipyparallel import Client, error
  from ipyparallel.tests import add_engines, launchers
label_desc: Use image node_id 9 for calling the ClusterTestCase obj's underlying member method code with example usage: obj.teardown_method() without return types